arm64: dts: rockchip: enable the gpu on px30-evb

The px30 has a Mali Bifrost gpu, so enable it on the evb board
and connect it with its supplying regulator.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Link: https://lore.kernel.org/r/20191208145508.3124-3-heiko@sntech.de

arch/arm64/boot/dts/rockchip/px30-evb.dts

@@ -132,6 +132,11 @@ &gmac {
 	status = "okay";
 };
 
+&gpu {
+	mali-supply = <&vdd_log>;
+	status = "okay";
+};
+
 &i2c0 {
 	status = "okay";